/Engine/Source/Editor/ContentBrowserData/Public/ContentBrowserItemData.h
Delegate used to validate that the proposed item name is valid
typedef TBaseDelegate_ThreeParams< bool, const [FContentBrowserItemData](API\Editor\ContentBrowserData\FContentBrowserItemData) &, const [FString](API\Runtime\Core\Containers\FString) &, [FText](API\Runtime\Core\Internationalization\FText) * > FOnValidateItem